How can I use my previews as "masters", wen the masters are irretrievably lost? My idea is to at least be able to save the lost pictures by using the Previews as the new "originals".

So, yes. Most of my master pictures are gone, long story - please don't ask why. The question now is whether I can use the previews (which are still there) which is surely better than nothing. But except for browsing, there's nothing I can do with them, unless they have a master file connencted. Has anyone got a clue how I could make Aperture treat these remaining preview as master files as well as previews, or in some way make this files useable.
Thank you very much for your help, if anybody out there has a clue how

So, yes. Most of my master pictures are gone, long story - please don't ask why.
I assume, your library is referenced? And the versions are now pointing to missing original master image files?
Then try the following - for each project separately.:
Select all images in a  project and drag them from the Bowser to a folder outside the library. This will export the previews as jpegs.
Now - with the images in the project still selected - use the command "File > Locate Referenced Files" to open the "reconnect" window. In the upper part of the reconnect Window select the first of your images that needs to be reconnected, and in the lower part point it to the corresponding  jpeg you exported. Hold down the alt/options-key⌥ to force the connect-buttons to appear. Press "Connect all".
Regards
Léonie
P.S: If the reconnect buttons refuse to become active, even with the⌥-key held down, check the filenames. The previews should be named exactly like the missing originals. I tried this in Aperture 3.4.5, but I am not sure, if it will work in all Aperture versions the same.

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